/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * arch/arm/src/armv7-r/arm_doirq.c
 *
 *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <tinyara/config.h>

#include <stdint.h>
#include <tinyara/irq.h>
#include <tinyara/arch.h>
#include <assert.h>

#include <tinyara/board.h>
#include <arch/board/board.h>

#include "up_arch.h"
#include "up_internal.h"

#include "group/group.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Public Data
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

uint32_t *arm_doirq(int irq, uint32_t *regs)
{
	board_autoled_on(LED_INIRQ);

#ifdef CONFIG_SUPPRESS_INTERRUPTS
	PANIC();
#else
	/* Nested interrupts are not supported */

	DEBUGASSERT(current_regs == NULL);

	/* Current regs non-zero indicates that we are processing an interrupt;
	 * current_regs is also used to manage interrupt level context switches.
	 */

	current_regs = regs;

	/* Deliver the IRQ */

	irq_dispatch(irq, regs);

#ifdef CONFIG_ARCH_FPU
	/* Check for a context switch.  If a context switch occurred, then
	 * current_regs will have a different value than it did on entry.  If an
	 * interrupt level context switch has occurred, then restore the floating
	 * point state and the establish the correct address environment before
	 * returning from the interrupt.
	 */

	if (regs != current_regs) {
		/* Restore floating point registers */

		up_restorefpu((uint32_t *)current_regs);
	}
#endif

	/* Set current_regs to NULL to indicate that we are no longer in an
	 * interrupt handler.
	 */

	regs = (uint32_t *)current_regs;
	current_regs = NULL;

	board_autoled_off(LED_INIRQ);
#endif
	return regs;
}
